Blackboard-eraser cleaner



Feb. 17, 1931.

A. A. BREUER BLACKBOARD ERASER CLEANER Filed Feb. 16, 1928 Feb. 11,1931. A. A. BREUER 1,792,570

BLAGKBOARD ERASER CLEANER Filed Feb. 16, 1928 2 Sheets-Sheet 2 gifiall/1% Adam A. .Brezaar,

Patented Feb. 17, 1931 UNITED STATES ADAM A. BREUER, OF CHICAGO,ILLINOIS BLACKBOARD-ERASER CLEANER.

Application filed February 16, 1928. Serial No. 254,716.

This invention relates to cleaning devices of the vacuum cleaner typeand, while not restricted for such purposes, is particularly applicableto the cleaning of small portable ob'ects such as blackboard erasers.

lleretofore it has been customary to move the suction applying meansover the object to be cleaned.

The principal object of the present invention is to provide a stationaryvacuum cleaning device adapted for cleaning small portable objects.

' Another object of the invention is to provide a rigid support(preferably temporary only) for a vacuum cleaner of customary portableconstruction.

A further object is to provide a cleaning attachment of short lengthadapted to be rigidly attached to the vacuum cleaner.

Other and further important objects of this invention will be apparentfrom the disclosures in the accompanying drawings and the followingspecification.

The invention (in a preferred form) is illustrated on the drawings andhereinafter more fully described.

On the drawings:

Figure 1 is a plan view of the device as a whole mounted on a bench.

Figure 2 is a perspective view of the support for the vacuum cleaner.

Figure 3 is an end view of the support showing the adjacent parts of thecasing in section.

Figure 4 is a side view of the device showing the support in section.

Figure 5 is an end elevation of the device as a whole mounted on abench.

Figure 6 is an end view of the brush attachment.

Figure 7 is a section on the line VIIVII of Figure 6.

As shown on the drawings: The vacuum cleaner proper consists of theusual casing 1 which houses the electric motor which drives the suctionfan in the fan casing 2. The fan casing is provided with the customaryinlet or suction orifice 3 and outlet orifice 4. To the latter isattached a fabric dust collecting bag 5. As shown, the casing 1 isprovided with a laterally extending handle 6 in which is the controlswitch 7. The construction above described is that of an ordinary typeof portable vacuum cleaner. My invention consists in providing a simpleform of rigid support without changing the construction of the vacuumcleaner proper. For this purpose I provide a base or support 8 formed atthe ends with upstanding flanges 9 and 10. The upper margins of theseflanges are curved to fit the casing 1 when the latter rests thereon. Tohold the casing in place a strap 11 is employed which may convenientlybe secured to the support intermediate its ends by screws 12 which alsoserve to attach the support to a bench or other part 13. This strap willnot alone serve to prevent the casing from rotating or axial movementexcept by friction. To provide a more positive grip on the casing otherholding means should be provided. A convenient method is to takeadvantage of the peripherally arranged ventilation holes 14: in thecasing as engaging means for lugs 15 on the flange 10. The brushattachment consists of an annular ring 16 having on one side internallyarranged lugs 17 adapted to engage complementarily formed lugsexteriorly arranged on the inlet orifice 3 of the vacuum cleaner. On theother side of the ring 16 is a circular brush 18 held in position bynails 19. This brush is formed with a number of holes 20 for the passageof air laden with the dust stirred up by the action of the brushbristles on the article to be cleaned. The operation of the device as awhole is illustrated in Figure 5, where a blackboard eraser 21 is shownin contact with the brush for cleaning purposes. It has been found thatthe felt blocks 22, of which the cleaning faces of such erasers arecomposed, tend to become shiny through use. This shiny surface, however,disappears as the eraser is scrubbed backwards and fowards over thebrush 18. r

If it is desired to use the vacuum cleaner as an ordinary portabledevice it isnecessary only to uncouple the brush attachment and connectthe desired form of attachment and loosen the strap 11.

I am aware that many changes may be made and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I therefore do not proposelimiting the patent granted hereon, otherwise than necessitated by theprior art.

I claim as my invention:

A device of the kind set forth comprising a motor and a casing, a basehaving upstanding flanges adjacent each end, such flanges being curvedto fit and contact with the motor casing, a strap secured intermediateits ends to said base at a point between said flanges adapted toencircle the said casing and hold the latter on said base, said strapsecuring means also effective to secure said base to a support.

In testimony whereof I have hereunto subscribed my name at Chicago, CookCounty,

Illinois.

ADAM A. BREUER.

